From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Alan Mackenzie Newsgroups: gmane.emacs.devel Subject: Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7% Date: Sat, 4 Sep 2021 15:43:40 +0000 Message-ID: References: <83a6kuyysv.fsf@gnu.org> <837dfwyird.fsf@gnu.org> <835yvgwdxb.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="24919"; mail-complaints-to="usenet@ciao.gmane.io" Cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Sep 04 17:44:47 2021 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mMXqZ-0006LC-Ci for ged-emacs-devel@m.gmane-mx.org; Sat, 04 Sep 2021 17:44:47 +0200 Original-Received: from localhost ([::1]:47604 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mMXqY-000572-8c for ged-emacs-devel@m.gmane-mx.org; Sat, 04 Sep 2021 11:44:46 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:45224) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mMXpZ-0004CN-SN for emacs-devel@gnu.org; Sat, 04 Sep 2021 11:43:45 -0400 Original-Received: from colin.muc.de ([193.149.48.1]:19784 helo=mail.muc.de) by eggs.gnu.org with smtp (Exim 4.90_1) (envelope-from ) id 1mMXpX-0005Tf-QQ for emacs-devel@gnu.org; Sat, 04 Sep 2021 11:43:45 -0400 Original-Received: (qmail 86278 invoked by uid 3782); 4 Sep 2021 15:43:41 -0000 Original-Received: from acm.muc.de (p2e5d5226.dip0.t-ipconnect.de [46.93.82.38]) (using STARTTLS) by colin.muc.de (tmda-ofmipd) with ESMTP; Sat, 04 Sep 2021 17:43:40 +0200 Original-Received: (qmail 5485 invoked by uid 1000); 4 Sep 2021 15:43:40 -0000 Content-Disposition: inline In-Reply-To: <835yvgwdxb.fsf@gnu.org> X-Submission-Agent: TMDA/1.3.x (Ph3nix) X-Primary-Address: acm@muc.de Received-SPF: pass client-ip=193.149.48.1; envelope-from=acm@muc.de; helo=mail.muc.de X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:273906 Archived-At: Hello, Eli. On Sat, Sep 04, 2021 at 18:36:32 +0300, Eli Zaretskii wrote: > > Date: Sat, 4 Sep 2021 15:32:57 +0000 > > From: Alan Mackenzie > > Cc: Eli Zaretskii , emacs-devel@gnu.org > > > Maybe to speed things up, another option is to grow the chunk size > > > a bit. > > Maybe. An advantage of a small chunk size is that fontifying a single > > screen can be done with a maximum 499 bytes "inefficiency" off the end > > of a screen. If we were to increase jit-lock-chunk-size to, say 2000, > > more of the next screen would be getting fontified, perhaps wastefully. > > I don't know how important this is. Maybe I should try it. > > Indeed. With jit-lock-chunk-size at 2000, time-scroll on xdisp.c takes: > > (current code): 16.4s > > (new proposed code): 16.1s > > .. This speed up may well be particular to CC Mode. > > Let's try jit-lock-chunk-size at 8000: > > (current code): 15.1s > > (new proposed code): 15.1s > > .. So, yes, it would seem a larger chunk size is advantageous for CC > > Mode. > How large (in lines and columns) is your window? The above numbers > are only meaningful with the window size. I'm running in a window with 65 lines and 118 columns. -- Alan Mackenzie (Nuremberg, Germany).